Question I have are the ones used are they big bore gm type or are they the standard r134a like in picture?
Has anyone taken them out to see if they look skinny or large bore like in picture.

i have a alldatadiy but it dont list any part number so i can crossference it. So im guess they change dependent on the hose manufacturer . So im unsure the size of the core. If if its ac delco which is mostly what I try to use for my replacement parts .

question
is big bore like a high side only port and low side both different core valves . I was wondering if the low is a skinny regular r134a .
These forums have been super great . I love the response and help i get .
So if anyone has done any core replacement on these Id like to know if im dealing with gm big bores on both or regular 134a valve core size . If u look closey there is a large difference.

Last edited by Packard; 07-22-2018 at 10:41 PM..

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There's a big hint if you compare your valve cores with the ones in those pictures. All but the standard shiny chrome one (left side) has a spring just below the tip that's seen when looking down service valves. Look at yours. If it doesn't have a spring just below the tip then its most likely the smallest one that's chrome plated. That's similar to tire valves but with a different seal (looks translucent). S-series cars use what may be considered a small ac system using standard valve cores. The others are for large ac systems taking a few pounds of refrigerant where more flow is needed when moving refrigerant from 30 lb canisters into a system. Small valves won't allow fast fluid flow. For cars, the standard valve core is almost universal for many cars, trucks and suvs.

Be aware - the valve core tool in the box of valves is for removing/replacing valve cores on an empty system. If your system has refrigerant in it, it's not the correct tool. If you remove any valve core, you risk an immediate release of refrigerant, oil and dye at whatever pressure the system has relative to ambient temperatures. If its 75F, pressures will be around 75 psi. 95F, 95 psi. The tool that allows removal and replacement without spewing out refrigerant at high pressure works with refrigerant in the system.

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Bought mine at Autozone a month or two ago. There was only one option on the shelf, was a pack of 2 valve cores in blister pack, along two black, plastic caps. Was $3.99 on the rack with all the cans of R134a

I'll try to see if I still have the package and remember to post the part number tonight